Grate for metallurgical apparatus



March 1929- J. E. GREENAWALT 1,704,631

-GRATE FOR METALLURGICAL APPARATUS Filed rc 16, 1927 5 Sheets-Sheet lMarch 1929. J. E. GREENAWALT 3 GRATE FOR METALLURGICAL APPARATUS FiledMarch 16, 1927 3 Sheets-Sheet 2 6 Avwevvroe:

Jo 11w 6. GEEfiA/AWALZ March 5, 1929. GREENAWALT 1,704,681

GRATE FOR METALLURGICAL APPARATUS Filed March 16, 1927 5 Sheets-Sheet 5//v van/roe.- JOHN A. GEE/5M4 WA Ar Patented Mar. :5, 1929..

U lTE srr GRA'IE FOR METALLURGICAL APPARATUS.

Application filed March 16, 1927. Serial No. 175,815.

My invention has relation to improvements in grates and consists in thenovel features of construction more fully set forth in the specificationand pointed out in the claims.

My improved grate is adapted for use in sintering apparatus or otherapparatus for the metallurgical treatment of ores, the material fromwhich is discharged or dumped by a tilting movement of the ore holder.In the following description of the invention, I will confine myself toits use in sintering apparatus as the invention is here used to greatestadvantage because the grate is particularly adapted to assist in thedischarge from the holder of the sintered or agglomerated material. Inorder to effectively discharge such material from the holder, the grateis composed of a plurality of bars capable of difierent qualities ofmovement. For instance, some of the bars are rotatable while others maybe moved bodily away from the normal supporting plane of the grate.

One of the objects of the invention is to bring about a differential ofmovement, as it is called, between the bars without resorting to acomplicated structure. In addition to providing a mechanism foractuating the grate bars that is simple, this mechanism must also bedurable and reliable in operation. I have also provided a grateconstruction whereinthe individual bars are readily removable forreplacement, one in Which the bars positively respond to a dumpingmovement of the holder, and one possessing further and other advantagesbetter apparent from a detailed description of the invention inconnection with the accompanying drawings, in which:

Figure 1 represents a top plan of one end of a sintering pan equippedWith my'improved grate; Figure 2 is an enlarged vertical cross sectiontaken through the pan on the line 22 of Figure 1 with parts broken away;Figure 2 is a vertical cross-section similar to that shown in Figure 2,the pan/ P, however, being shown partially rotated to dumping positionand the grate bar frames rocked to effect a movement of the gratebars'for the purpose of dislodgingany-material adhering thereto; Figure3 is .an enlarged vertical longitudinal section through the pan taken onthe line 3-3 of Figure 1; Figure 4 is a top plan of the frame in whichthe grate bars are mounted; Figure 5 is a combined side elevation andvertical longitudinal section of the grate bar frame; Figure 6 is avertical cross-section through the frame taken on the line 66 of Figure5; Figure"? is an end elevation of said frame; Figure 8 is a sideelevation of one of the long bars adapted for movement away from thegrate bar frame; Figure 9 is an end elevation of said long bar; Figure10 is a side elevation of one of the short rocking bars; Figure 11 is avertical cross-section taken on the line 11-11 of Figure 10; Figure 12is a side elevation of the grate bar that serves to lock the other gratebars in place; Figure 13 is a vertical cross-sectionthrough said'bartaken on the line 13, 13 of Figure 12; and Figure 14 is a verticalsectional detail taken on the line 1414 of-Figure 3.

Referring to the drawings, P represents the sintering pan or holder inwhich the grate G comprising my invention is disposed. The pan P isadapted for rotation about its longitudinal axis denoted by the dot anddash line w, the mechanism for rotating the pan not being shown hereinas it forms no part of the present invention, but

is fully described in my patent on sintering 21tpp7aratus, No. 1,617,561 dated February 15,

A plurality of reinforcin ribs 1 extend transversely across the pan Iand in addi tion to acting as stiffening members, they serve also tosupport a series of grate bar frames 2,2 etc. The top component 30f theribs 1 is U-shaped, each side4c of said U-shaped component having anoutwardly extending flange 5, and there are aligning openings 0, 0, inthe sides 4, 4 of component 3 equally spaced along the length thereof.

Supporting arms 6, 6 having grooves 7, 7'

to receive flanges 5, 5 are fitted over the outer faces of thecomponents 3, 3 opposite the openings 0, 0, therein and secured firmlyin place by a bolt 8 which traverses openings 0', 0 in the arms 6, 6 andthe openings 0, 0

in the component 3, a nut 9 being passed over 7 the threaded end of thebolt 8. Thus supiporting arms 6, 6 extend upwardly in pairs from thecomponent 3 of ribs 2 in equally spaced relation from one side to theother of the pan for the purpose of carrying the grate bar frames 2.Dead plates 10 are bolted to the inside of each end wall 11 of the pan,

said dead plates being provided with sockets 12 in alignment withopenings 13, 13 in the heads 14, 14: of supporting arms 6, 6.

The grate bar frames 2 adjacent to the ends of the pan P are pivotallysupported on bearing pins 15, 15, the former being driven into openings16 inthe end wall 17 of each frame 2 and having bearing in sockets 12 ofdead plates 10. The pins 15' traverse openings 13, 13 in the supportingarm 6, 6, and the end walls 18 of adjacent frames 2 are disposedbetween'arins 6, 6 and are supported by the pin 15 which is also passedthrough openings 19, 19 in said end walls 18. Thus, the juxtaposedframes 2 between the end wall 11 of the pan P and the next adjacent rib1 are pivotally supported by the end wall dead plate 10 and nextadjacent rib 1, while the'intermediate supporting frames 2 are pivotallysupported by adjacent ribs ures 1 and 3). v I

The grate supporting frame 2 (as shown in Figures 4 .to 7 inclusive) hasside members 20, 20 integrally formed with the end walls 17 and 18, saidside walls being in the shape of an inverted L, and terminal grate bars21, 21 are formed integrally with the side members 20, 20. A pendant arm22 extends downwardly from said side members. As willbe fully explainedhereinafter,'each frame 2 supports a plurality of short grate bars'23and each pair of adjacent frames 2 support a plurality of long gratebars 24, the long grate bars alternating with. the short ones as shownin Figure 1. The short bars (Figure 10) are each provided with adepending neck or stem 1 25 terminating in lateral flanges 26, 26: Inmounting the short bars on the frame 2, the flanges 26, 26 are passedthrough oppositely disposed slots 27, 27 in the horizontal components ofthe side members 20, 20 and the bars are slid aiong the side members 20,2O

to their respective'positions on the frame 2, it being-understood thatin assembling the bars, on the frames, two frames are handled together,and the short bars are alternated wit-h the long ones until all of thebars are on place on two adj acent frames 2, except the last short bars28 which are positioned over the slots 27, 27 These bars 28 which serveto look the others in place must be of a slightly different constructionand are shown in Figures 12 and 13. Instead of the neck 29 beingflanged, a plate 30 is provided, said plate being passed throughopenings 31, 31 in the members 20 before the bar 28 is put in place, andthe bar 28 is then secured to the plate 30 by means, of screws 32, 32.Thus, all of the bars, both-long and short, are mounted on adjacentframes 2, 2, the short bars being secured to the frames so that anymovement imparted. to the frames will be partici- 1, 1 (as shown in Figpated in bythe short bars, while the long bars are capable ofindependent movement on the frames as will be apparent. when themechanism for rocking the frames is described.

A sliding weight 33 is mounted in oppositely disposed raceways 34, 3 1extending transyersely across the pan beneath each panel betweenadjacent ribs 1, 1, and there are slots 35 formed in the weight 33 to receive the lower ends of pendant arms 22 of the frames 2, 2, etc. Theslots 35 are narrowest at the center of the weight 33 and flareoutwardly toward the top and bottom surfaces thereof to accommodate thedifferent positions of the pendant arms 22 as they are rocked by amovement of the weight 33 to be more fully described in connection withthe operation of the invention.

By referring to Figure 8,'it will be seen thatthe long bars 24 have apair of depending stems 21),25 spaced to correspond with thespaces'between adjacent frames 2 since these long bars are received bytwo adjacent frames as above pointed out. The flanges 26, 26 areinclined from the plane of the bar, the longer side 25 of each stem 25being arcuate for a purpose to be morefully apparent hereinafter.

In describing the operation of my improved grate, we will assume thatthe sintering pan P has been moved to the position shown. in Figure 2 toeffect a dumping of the contents of said pan. The tilting of the pan tothis position overcomes the friction of the weight 33 in the raceways34, 34 and the weight 33 slides to the position shown in F' ure 2imparting to the pendant arms 22 and to'the grate bar frames 2 framesare rotated from their normal posi- 1 a rocking movement in which thegrate bar tion shown in Figure 2. Owing to the fact that the short bars23 are snugly fitted into the frames 2, these short bars willparticipate to the full extent in the rockine movement of the frames 2.However,

ported in two adjacent frames 2, 2, cannot rock with either of saidframes, but instead v the long bars, which as we have seen, are eachsup;

of rocking, will be lifted by the corresponding sides 20 of the frames2, 2 that are moved upwardly. As these corresponding sides are raised,obviously, the opposite sides of the frames 2 will be lowered andthegreat length of the sides 25 of the stems 25' will permit of freemovement'in opposite directions of the downwardly moving side members 2Oand'upwardly moving grate bars- 24, all of which is clearly illustratedin Figure 2. The differential of movement caused by the short barsrotating'and the long bars moving bodily away from the normal supportingplane of-thegrate will operate to forcibly break loose anymaterial thathas been caused to adhere to the grate bars durnate bars.

ing the metallurgical treatment given to the material while on thegrate.

Having described my invention, I claim:

1. A grate comprising a supporting frame, a plurality of grate barsmounted in said frame, grate bar actuating means for imparting to someof the bars a rocking movement, and to other bars a movement bodily awayfrom the normal supporting plane of the grate.

2. A gratecomprising a frame, a plurality of grate bars mounted injuxtaposition in said frame, actuating means for imparting movement tothe frame to effect a rocking of some of the bars and a movement awayfrom the frame of other bars. 7 I

3. A grate comprising a supporting frame, a plurality of grate barsmounted in juxtaposition in said frame, means for imparting movement tothe frame to efiect a rotation of alternate bars, and a bodily movementaway from the frame of alter- 4. A grate comprising a su porting frame,a plurality of grate bars mounted in. juxtaposition in said frame, gratebar actuating means for rocking said frame and certain of the barstogether therewith and simultaneously therewith efiecting a movement ofother bars with relation to said frame. I

5. A grate comprising a supporting frame, a plurality of grate barsmounted in said frame, and means for rocking the frame for imparting adifferential'of movement between the bars. I j

6. A grate comprising a supporting frame,means for rotating said frame,a plurality of grate bars mounted in said frame and. rotatabletherewith, complementary grate bars mounted in the frame and adapted tobe moved away from the frame by the rotary movementimparted thereto.

7 A grate comprising a supporting frame, a plurality of grate barsmounted therein to form the grate supporting surface, means for rotatingsaid frame and some of said bars, said means also operating to move,other bars out of the plane of the grate supporting surface. 8. A. gratecomprising a series of supporting frames, a plurality of bars mounted'injuxtaposition in each of saidframes to form the grate supportingsurface, means for im-\ parting relative movement between some of thebars in adjacent frames, and movement to the other bars to a positionout of the plane of said supporting surfaces. j

9. A grate comprising a series of supporting frames, means for rockingsaid supporting frames, a .plurality of grate'bars fixed in each of saidframes and adapted to be rocked therewith,'other grate bars supported byand extending across two adjacent supporting frames, said last mentionedbars being moved relatively to the frames on rocking the same.

10. A grate comprising a series of sup-.

of all the frames lying-in parallel planes .and forming the gratesupporting surface,

some of said bars being mountedon fixed axes for rotation Within saidplanes, other bars' being mounted for movement within said planes inparallelism with the grate supporting surface, and means for impartingto said bars their respective movements.

12. A grate comprising a supporting frame, a plurality of grate barsmounted in juxtaposition in said frame, and grate bar actuating meansfor rocking said frame to rotate said bars in the planes of theirlongitudinal axes.

13 A grate comprising a series of supporting frames disposed in closelyspaced relation, a plurality of juxtaposed grate bars in each of saidframes, corresponding bars of adj acentframes lying in a common plane,and grate bar actuating means for simultaneously rotating the frames toeffect a relative movement between the bars lying in the same plane j 114:. A grate comprising a supporting frame, a plurality of grate barsremovably mounted in said frame, means for locking said bars in theframe and means arranged below said supporting frame for rocking theframes to effect a dumping movement of the grate bars.

15. A grate comprising a supporting frame, a plurality of grate barsmounted in the frame, .said frame and grate bars having cooperatingformations to hold the bars in the frame, one of said barsserving as alock bar to prevent displacement of any of the bars, and means forimparting movement to the frame to effect a rocking of said grate bars.

16. In an apparatus for treating'ores comprising a holder, a gratedisposed within said holder, said grate comprising a series ofsupporting frames extending from side to side of the holder androtatably mounted therein, a plurality of grate bars fixed in each ofsaid frames and disposed transversely thereto, the contiguous bars ofadjacent frames lying in a common-plane extending transversely of theholder, means for rotating the holder on an axis perpendicular to theplanes of the grate bars, and

side of the holder and rotatably mounted therein, a plurality of gratebars fixed in each of said frames and disposed transversely thereto, thecontiguous bars of adja cent frames lying in a common plane extendingtransversely of the holder, means for rotating the holder on an axisperpendicular to the planes of the grate bars, and

means for imparting a partial rotation to the.

grate bar frames and effecting a relative movement between abutting endsof the grate bars.

18. In an apparatus for treating ores comprising a holder, a gratedisposed within said holder, said grate comprising a series ofsupporting frames extending from side to side of the holder androtatably mounted therein, a plurality of grate bars fixed in each ofsaid frames and disposed transversely thereto, the contiguous bars ofadj acent frames lying in a common plane extending transversely of theholder, means for rotating the holder on an axis perpendicular to theplanes of the. grate bars, and means forimparting a partial rotation tothe grate bar frames and some of the bars therewith, said rotation ofthe grate bar'frames operating to move other grate bars bodily away fromsaid frames.

19. In an apparatus for treating ores comprising a holder,'a gratedisposed within said holder, said grate comprising a series ofsupporting frames extending from side toside of the holder and rotatablymounted therein, a plurality of grate bars fixed in each of said framesand disposed transversely thereto, the contiguous bars of ad abar framesto effect a rotation of some of the grate bars and a lateral movement ofothers.

20. In an apparatus for treating ores comprising a holder, a gratedisposed within said holder, said grate comprising a series ofsupporting frames extending from side to side of the holder androtatably mounted therein, a plurality of grate bars fixed in each ofsaid frames and disposed transversely thereto, the contiguous bars ofadjacent frames lying in a common plane extending transversely of theholder, means for rotating the holder on an axis perpendicular to theplanes of the grate bars, and means for rotating alternate bars andimparting a lateral movement to other alternate bars with a rotation ofthe holder.

- 21. A grate comprising a supporting member, a plurality of grate barsmounted in juxtaposition upon said member, and means for impartingmovement to the member, whereupon said member operates to move the gratebars out of their normal supporting plane.

22. A grate comprising a supporting member, a plurality of grate barsarranged to be movably held on said supporting member, and meansoperable below said member for imparting a rocking movement to some ofsaid'bars and a lateral movement to other bars.

In testimony whereofv I hereunto afiix my signature.

.JOHN'E. GREENAWALT.

